Avatron Software's Air Sharing is billed as "the easiest way to take documents with you and view them on the go". Thanks to a generous introductory offer,  Air Sharing is available for free from the App Store for the first two weeks, a savings of  $6.99. With Air Sharing you can mount your iPhone or iPod touch as a wireless drive on any Mac, Windows or Linux computer. Simply drag and drop documents to your iPhone and take the files with you on the go. This is a limited time offer, so go get it. See what our members are saying about Air Sharing in the forums.

iPhone Forums via Lifehacker